Sentence examples for ppm from inspiring English sources

CO2 has reached 400 ppm, meaningful action is still not in sight, and people who really understand the science understand what is at stake are getting very worried.

But the Intergovernmental Panel on Climate Change believes the right number is 450 ppm.

Hitherto diesel contained up to 500 parts per million (ppm) of sulphur, but the new rules limit sulphur to 15 ppm.

One is a limit on carbon dioxide, the main long-lived greenhouse gas, of 350 parts per million (ppm) in the atmosphere.

That is perhaps why in much of China regulations allow the sulphur content in petrol to be as high as 150 parts per million, whereas European standards cap it at 10 ppm.

HP's new Officejet Pro L7000 series of all-in-one inkjets offers street prices starting around $300 and speeds of 35 pages per minute in monochrome and an impressive 34 ppm in colour.

When Britain began the process in the 18th century, the atmosphere's carbon-dioxide level was 280 parts per million (ppm).

The draft table casts doubt on how solid the link really is between 450 ppm and a 2°C rise.

That level has already been exceeded: the latest reading from the Mauna Loa observatory (source of the most reliable measurements) was 404 ppm in May.Moreover, concentrations are rising.

AT NOON on May 4th the carbon-dioxide concentration in the atmosphere around the Mauna Loa Observatory in Hawaii hit 400 parts per million (ppm).

If you then have a situation where the marginal benefit of emission reductions falls very sharply at some threshold — e.g., you have a chemical where if it ever gets above 10 parts per million everybody dies, but if it's less than that there's no effect — then you want to use a permit system and pin down the quantity at 10 ppm minus your safety factor.